HYDROARBONS – II HALOALKANES AMINES

109 Pages·2013·1.9 MB·English

CHEMISTRY

HYDROARBONS – II
HALOALKANES
AMINES
1
CHEMISTRY
I.HYDROCARBONS – II
2
CHEMISTRY
1] The cycloalkane which easily
undergoes ring opening reaction
when heated with H and Ni is
2

1] cyclohexane
2] cyclopentane
3] cyclobutane
4] cyclopropane
3
CHEMISTRY
ring opening reaction is a method of
determining order of stability.
1] cyclohexane= resistant to ring
opening
2] cyclopentane = 3000 C
3] cyclobutane = 2000 C
4] cyclopropane = 800 C

Ans: 4] cyclopropane

4
CHEMISTRY
2] The cycloalkane which is most
stable according to Baeyer’s angle
strain theory is

1] cyclohexane
2] cyclopentane
3] cyclobutane
4] cyclopropane
5
CHEMISTRY
1] cyclohexane = -5˚12`
2] cyclopentane = 0˚ 44`
3] cyclobutane = 9˚ 44`
4] cyclopropane = 24˚ 44`

Ans:
2] cyclopentane

6
CHEMISTRY
3] 1,4-dibromobutane is treated with
sodium metal in dry ether. The
product obtained is

1] butane
2] 1-butene
3] cyclobutane
4] 1,3-butadiene
7
CHEMISTRY
Intra-molecular Wurtz reaction, also
called Freund reaction.

Br Na in dry ether

Br

Ans: 3] cyclobutane
Zinc may be used instead of sodium

8
CHEMISTRY
4] The most stable conformation of
cyclohexane is
1] chair

2] half-chair

3] boat

4] twist-boat

9
CHEMISTRY

Due to least interaction between
C-H and C-C bonds, chair form is
most stable
Ans: 1] chair form

10